The UK does not require a license for a TV. They require a license to receive live television broadcasts (regardless of medium) and/or use BBC iPlayer.
Watching C-SPAN's live stream on your laptop would, for example, require a TV license, whereas watching Netflix or playing video games using a TV as a display would not.
The definition of "live television broadcast" is somewhat vague, and is essentially "duck typed". The BBC has said an online tv channel would count whereas watching streamers on Twitch wouldn't.
Also, the license covers the address, but there are weird exceptions, such as when watching on a laptop whether that laptop is plugged in or not.
(I live in the UK, and have informed TV licencing that my address does not require a license so they will stop wasting paper by sending threatening letters)